I just installed the premium rear console. It does come at a rather steep price of 600 USD, but it just makes the rear area look that much more "premium". Installation is pretty easy. You just place the thing on the back seats, guide a strap underneath the rear seats and pull the strap tight using an existing hook on the back of the rear seats.

The console does move if you give it a good shove and I would wish that there would also be a way to tighten it down at the front of the seat somehow. Here are some pictures of the console after installation: